Fusion – Create a Solid color or Gradient element

Software:
Fusion 9

When you need a solid color source or background for your composite,
The Background node is just that,
It provides either a flat color plate or 4 types of gradients (color ramps).
Set the plate fill type in the Color tab of the node’s settings, and the format (size) in the Image tab.

Add Tool > Creator > Background

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Fusion – Multiply color with alpha on import to fix rough edges

Software:
Fusion 9

When importing transparent graphic files, depending on the way the file was saved, you may encounter rough white edges at the transparency border.
In this case the image colors must be multiplied with the Alpha channel values.

In the Import tab of the Loader node,
Check Post Multiply by Alpha.

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Note:
You can use a Matte > Matte Control node to further refine the edges.

Example image from:
www.mrcutout.com

Clamp Colors in Fusion

Software:
Fusion 9

To Clamp (limit / clip) the color values in a Fusion flow:

  1. Add a Color > Brightness / Contrast node to the composition and connect it to the desired output.
  2. and activate the Clip Black and Clip White options at the bottom of the Brightness / Contrast node parameters.
  3. Set the Low and High parameters to set the wanted color limits.]

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Related:
Clamp colors in Photoshop 32 bit float color mode